Rock Classification

Essay specific features

 

Issue:

Science

 

Written by:

Paul M

 

Date added:

November 19, 2016

 

Level:

University

 

Grade:

A

 

No of pages / words:

3 / 691

 

Was viewed:

931 times

 

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Essay content:

This is broken down mainly into grain size. First there are intrusive, or plutonic igneous rocks. These types of rocks cool within the crust and forms large, visible crystals. The opposite would be extrusive, or volcanic rocks. These cool at the surface rapidly, forming small grains. A combination of the two would be porphyritic, large grains in an aphanitic, or extrusive matrix...
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The opposite would be extrusive, or volcanic rocks. These cool at the surface rapidly, forming small grains. A combination of the two would be porphyritic, large grains in an aphanitic, or extrusive matrix. Secondly, composition is used to classify igneous rocks. There are four types, ultramafic, mafic, intermediate, and felsic...
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